Storm Collar Height

[Greg1881]

I bought a home two years ago. The stove pipe on the outside roof is about 5.5ft high. The storm collar on the stove pipe is about one foot from the roof (side towards the roof edge) and on the backside about 4" from the roof. Last year the storm collar was completely bent into the stove pipe and touching the rubber boot. Thinking it was a cheap storm collar I replaced it. The same thing happen this last winter. I believe the snow load is pushing down on the storm collar. How high should a storm collar be from the roof on the side closest to the roof. Do I really need the storm collar, one guy said just leave it off.

Thanks Greg

 

[DAKSY]

The storm collar should be siliconed to the chimney at the point where the roof flashing cone ends.
AFIK, RUBBER should NOT be a part of that flashing due to Clearance to Combustibles guidelines
If you are having problems with snow, you should have a snow wedge installed to direct the
snow AWAY from your chimney. If you do NOT use a storm collar, you may possibly have some
water penetration thru the flashing

 

[Highbeam]

Metal roofs often use something resembling rubber or silicone for the actual roof penetration.

 

[EatenByLimestone]

I used aluminuminized tape to secure the bottom of the storm collar. Not so much for snow, but I was getting water blown up it. The tape might stiffen it up against snow sliding into it.

 

[Greg1881]

I forgot to mention the home has a metal roof with a rubber boot where it goes thru the roof

 

[bholler]

I have never seen a storm collar used with a rubber boot. I would switch it out for real metal flashing.